Natural Environment Research Council (NERC) (NE/E01559X/1)

A Freing

A Paulmier

AC Martiny

AC Mosier

AE Santoro

AR Babbin

B Thamdrup

C Berg

C Brochier-Armanet

C Nevison

CA Francis

CR Löscher

DE Bakker

DL Arevalo-Martinez

HJE Beaumont

HW Bange

IA Sanders

J Jason

JA Kozlowski

JC Nicholls

JE Dore

KJ Purdy

KV Zhalnina

L Farias

L Stramma

LA Codispoti

LJ Shaw

LP Nielsen

M Ribas-Ribas

MB Lund

N Wrage

NJ Hardman-Mountford

P Lam

RF Weiss

SG Wakeham

ST Wilson

SWA Naqvi

T Dalsgaard

T Kalvelage

TJ Goreau

V Kitidis

W Martens-Habbena

Nature Communications

PubMed

Trimmer, M

Chronopoulou, P-M

Maanoja, ST

Upstill-Goddard, RC

Kitidis, V

Purdy, KJ

Queen Mary Research Online

Nitrous oxide as a function of oxygen and archaeal gene abundance in the North Pacific

AbstractOceanic oxygen minimum zones are strong sources of the potent greenhouse gas N2O but its microbial source is unclear. We characterized an exponential response in N2O production to decreasing oxygen between 1 and 30 μmol O2 l−1 within and below the oxycline using 15NO2−, a relationship that held along a 550 km offshore transect in the North Pacific. Differences in the overall magnitude of N2O production were accounted for by archaeal functional gene abundance. A one-dimensional (1D) model, parameterized with our experimentally derived exponential terms, accurately reproduces N2O profiles in the top 350 m of water column and, together with a strong 45N2O signature indicated neither canonical nor nitrifier–denitrification production while statistical modelling supported production by archaea, possibly via hybrid N2O formation. Further, with just archaeal N2O production, we could balance high-resolution estimates of sea-to-air N2O exchange. Hence, a significant source of N2O, previously described as leakage from bacterial ammonium oxidation, is better described by low-oxygen archaeal production at the oxygen minimum zone’s margins.</jats:p

Mark Trimmer

Panagiota-Myrsini Chronopoulou

Susanna T. Maanoja

Robert C. Upstill-Goddard

Vassilis Kitidis

Kevin J. Purdy

Crossref

Oceanic oxygen minimum zones are strong sources of the potent greenhouse gas N2O but its microbial source is unclear. We characterized an exponential response in N2O production to decreasing oxygen between 1 and 30 μmol O2 l−1 within and below the oxycline using 15NO2−, a relationship that held along a 550 km offshore transect in the North Pacific. Differences in the overall magnitude of N2O production were accounted for by archaeal functional gene abundance. A one-dimensional (1D) model, parameterized with our experimentally derived exponential terms, accurately reproduces N2O profiles in the top 350 m of water column and, together with a strong 45N2O signature indicated neither canonical nor nitrifier–denitrification production while statistical modelling supported production by archaea, possibly via hybrid N2O formation. Further, with just archaeal N2O production, we could balance high-resolution estimates of sea-to-air N2O exchange. Hence, a significant source of N2O, previously described as leakage from bacterial ammonium oxidation, is better described by low-oxygen archaeal production at the oxygen minimum zone’s margins

Plymouth Marine Science Electronic Archive (PlyMSEA)

Trimmer, Mark

Chronopoulou, Panagiota-Myrsini

Maanoja, Susanna T.

Upstill-Goddard, Robert C.

Kitidis, Vassilis

Purdy, Kevin J.

Warwick Research Archives Portal Repository

https://trepo.tuni.fi/bitstream/10024/125940/1/Nitrous_oxide_as_a_function_of_oxygen_and_archaeal_gene_abundance_in_the_North_Pacific.pdf

Nitrous oxide as a function of oxygen and archaeal gene abundance in the North Pacific

Abstract

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Queen Mary Research Online

Crossref

Plymouth Marine Science Electronic Archive (PlyMSEA)

Warwick Research Archives Portal Repository